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Q: Fachverband Quantenoptik und Photonik

Q 13: Posters: Quantum Optics and Photonics I

Q 13.11: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Critical properties of the extended Bose-Hubbard model with global interactions — Shraddha Sharma¹, •Rebecca Kraus², Simon B. Jager², Tommaso Roscilde^3,4, and Giovanna Morigi² — ¹The Abdus Salam International Center for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy — ²Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — ³Laboratoire de Physique, CNRS UMR 5672, Ecole Normale Supérieure de Lyon, Université de Lyon, Ens de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France — ⁴Institut Universitaire de France, 103 boulevard Saint-Michel, F-75005 Paris, France

We consider a bosonic gas in a two-dimensional optical lattice. The atoms interact via s-wave scattering and via the global interactions induced by the coupling with a cavity. The phase diagram here is characterized by a Mott-insulator (MI), superfluid (SF), charge-density (CDW) wave, and supersolid (SS) phase, which emerge from the interplay between kinetic energy, contact interaction, and global interactions. We determine the entanglement entropy and entanglement spectrum across the phase diagram by means of a controlled perturbative expansion above the mean-field ground state. We relate their behavior to the physical excitation spectrum and discuss the nature of the phase transitions.